BOB DOUGHTY: This is SCIENCE IN THE NEWS, in VOA Special English. I’m Bob Doughty.
FAITH LAPIDUS: And I’m Faith Lapidus. This week, we tell about vitamins.
BOB DOUGHTY: Many jobs must be done with two people. One person takes the lead. The other helps. It is this cooperation that brings success.
So it is with the human body. Much of our good health depends on the cooperation between substances应该是降低. When they work together, chemical reactions take place smoothly. Body systems are kept in balance.
Some of the most important helpers in the job of good health are the substances 注意读音we call vitamins.
这次读得速度快了一点，并稍微注意了一点语调。先谢谢砖 (专) 家。
